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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f511ac1de879451a4ed02c64bb4d654aa94ee323467dd875073fe8fb69f8cda2' 
  AND token = 'JksZJh3/r3J1PenAG32sA4wvjOvzSH1HodFh6M6M7W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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