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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3cb9613f3f2d0d495f083f0fe5e32bc12f0b17cd20d82bc8d412fc887803510' 
  AND token = 'vbE6JXEhJ1Qq0xt8kYmJTuIdeOaGCrbG7jsn2ECIidQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}