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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8255444f3032a85ae65951faa45848e95a841d559b76dbfddb5e5fe4be5e758e' 
  AND token = '0h10n+AfyiPJA5bLw3g4wm7kVBCJ9OAOFIgaI4u4TI8=' 
  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"
    }
  }
}