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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c3a3dea50e66a38f4777f835f11b07d4117061a9d43b11fb879f52e5a826a3' 
  AND token = 'y0IBNVii3b41JF7kf2hhpNLPLtKYISJa3x9SiIxcWrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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