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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f0841b38114d2cf997154d6a5175ecc6b1846bb382b465e99d5eb30766df8d' 
  AND token = '5ey3aJuSht5gGptSKgZewDLNtY949iRxOOXhdPXE88k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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