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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f0def4e8ac2277e16e5a93ef317479ed2464b95bc1a9e681765e3089a73b4c0' 
  AND token = '9BiNwHkZtb3JKNe6p/ApAbuV/ILiSz1ga1DvvjyLvsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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