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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07904e71bbfc86521c7a74607b15e47c32fb3ce2b8a896dd6784c68b847d2a4' 
  AND token = 'kitEji399W968Y2AIq+ZssWL+k0xM2uyJattRX2DrFg=' 
  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"
    }
  }
}